Finding the Third Proportional to 190,605 and 280,363.50

Step by Step Solution

1. Step 1: Write the proportion equation
   190,605 : 280,363.50 = 280,363.50 : x
2. Step 2: Convert to fraction form
   190,605/280,363.50 = 280,363.50/x
3. Step 3: Cross multiply
   190,605x = 280,363.50 × 280,363.50
4. Step 4: Simplify right side
   190,605x = 78,603,692,132.25
5. Step 5: Solve for x
   x = 78,603,692,132.25/190,605
6. Step 6: Final answer
   x = 412,390.50